Optical sampling interface system for in vivo measurement of tissue
First Claim
1. An optical sampling interface system comprising:
- an optical probe placement guide for controlling variations in sample volume;
means for controlling surface reflection of an optical signal;
an occlusion plug for stabilizing surface hydration of a measurement site, said occlusion plug adapted to fit into an aperture in said placement guide between measurements, wherein said occlusion plug is removably attached at an exterior surface of said guide;
wherein sampling error is minimized, eliminated, reduced or compensated.
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Accused Products
Abstract
An optical sampling interface system minimizes and compensates error resulting from sampling variations and measurement site state fluctuations. Components include: An optical probe placement guide having an aperture wherein the optical probe is received, facilitates repeatable placement accuracy on surface of a tissue measurement site with minimal, repeatable disturbance to surface tissue. The aperture creates a tissue meniscus that minimizes interference due to surface irregularities and controls variation in tissue volume sampled; an occlusive element placed over the tissue meniscus isolates the meniscus from environmental fluctuations, stabilizing hydration at the site and thus, surface tension; an optical coupling medium eliminates air gaps between skin surface and optical probe; a bias correction element applies a bias correction to spectral measurements, and associated analyte measurements. When the guide is replaced, a new bias correction is determined for measurements done with the new placement. Separate components of system can be individually deployed.
192 Citations
24 Claims
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1. An optical sampling interface system comprising:
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an optical probe placement guide for controlling variations in sample volume; means for controlling surface reflection of an optical signal; an occlusion plug for stabilizing surface hydration of a measurement site, said occlusion plug adapted to fit into an aperture in said placement guide between measurements, wherein said occlusion plug is removably attached at an exterior surface of said guide; wherein sampling error is minimized, eliminated, reduced or compensated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An apparatus for minimizing optical sampling error at a tissue measurement site due to fluctuations of surface conditions, comprising:
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an element defining a probe aperture, wherein said element is fabricated from a flexible material, wherein said element provides for stabilization of the measurement site and deformation of underlying tissue without applying undue force to a targeted tissue volume; an occlusion plug for insertion into said aperture between measurements; and means for removably attaching said plug at an exterior surface of said element defining said probe aperture. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification